Ajuntament de Barcelona. Barcelona city council. The Barcelona city hall and office of the mayor of Barcelona is on Plaça de Sant Jaume in the gothic area of Barcelona. This is the same location as the original forum and seat of government of Barcelona when it was founded by the Romans, then called Barcino. The address of the website of Barcelona city is www.barcelona.cat which has a lot of useful information for visitors and residents. Barcelona also has a number of mobile apps for use on smartphones. The Barcelona city website is in Spanish and Catalan with many sections in English. The current mayor of Barcelona is Ada Colau from the Barcelona en Comú party.